Jeff was a great help in regards to increasing my quant score on the GMAT. I had an ambitious goal of raising my score 30 points in one month. I had been using a self-paced study plan with another firm and was struggling to get my score higher. Just a few hours with Jeff taught me things that greatly helped my score. I was able to improve my quant score by 5 points (42 to a 47)! If I could have started my studying over, I would have just hired Jeff and used his program from the beginning. Jeff was incredibly responsive throughout the entire process. I also found the Target Test Prep course to be incredibly helpful.